It is closely related to the more common shallow-water species Oregonia gracilis, the graceful decorator crab.

Like other majoid crabs, Oregonia bifurca are sexually dimorphic, with males larger than the females.

The entire body and the long and slender legs are covered densely with curving yellow hair.

The rostrum is divided into two short, flat, and gradually tapering horns, hence the common name "split-nose".

The upper and lower surfaces of the body covered densely with small protuberances (tubercles) with soft and long yellow hairs that curve at the tip.

The claw-bearing legs (chelipeds, the first pereiopod pair) are much longer and somewhat elongated in males than they are in females.

The first pair of pleopods of the males are also enlarged at the tips and possess rows of long filaments.

[3] Oregonia bifurca can be readily distinguished from O. gracilis in having shorter rostral horns that curve away from each other, triangular postorbital spines closer to the eyes and pointing more forward, a wider front end of the carapace, and long and slender dactyli on their walking legs.

They live at the surface of seamounts and guyots, in habitats of sand, broken shell, and foraminiferous mud.